diff --git a/internal/webrtc/server.go b/internal/webrtc/server.go
index 0bdd8341..a3c1ff8d 100644
--- a/internal/webrtc/server.go
+++ b/internal/webrtc/server.go
@@ -125,6 +125,8 @@ func outputWebRTC(w http.ResponseWriter, r *http.Request) {
 		_, err = w.Write([]byte(answer))
 
 	default:
+		w.Header().Set("Content-Type", mediaType)
+
 		_, err = w.Write([]byte(answer))
 	}